In the archive video from 2006, the Labour leader is seen walking onto the set of the Daily Politics show, having volunteered to be the show's Secret Santa.

His identity is shrouded in secrecy by a huge beard as the programme's guests Meg Hillier, the Labour MP, Alan Duncan, the Tory MP and Lib Dem Lembit Opik attempt to work out who it could be.

Ms Hillier was the first to guess his identity correctly after being given a series of clues by presenter Jenny Scott.

The guests had been told that Santa had represented the smallest constituency in Britain since 1983.

They also learnt that he was one of just 12 Labour MPs to back Plaid Cymru and the SNP's call for an inquiry into the Iraq War.

Mr Opik incorrectly guessed that Santa could be Bob Marshall-Andrews.

A final clue that he had chaired the parliament wing of CND and had described Gordon Brown's support for Trident as "sad and absurd" was enough for Ms Hillier to correctly guess who was behind the outfit.

As Mr Corbyn took off his fake beard, his award-winning real beard emerged from underneath.